Insulating compound.



IUD.

bUlVH'UOl l lunlo,

thirty-live to forty-five par s water.

Ui'tlSS ITED STATES i "Le Silicates.

PATENT ()FFICE.

HENRY NOEL POTTER, OF GOTTINGEN, GERMANY, ASSIGNOR TO GEORGE \VESTlNGllOUSE, OF PITTSBURG, PENNSYLVANIA.

lNSULATlNG COMPOUND.

SPEOIFICA 'ILIC-ll forming part of Letters Patent No. 694,989, dated March 11, 1902.

Applic. I.-

which I have used in my recent electrical work, and I find itadmirably suited to the purpose of an electrical insulator, possessing qualities which particularly adapt it to be conveniently manufactured in the form of small insulating bodies for carrying circuitterminals and keeping them insulated from each other. One quality of this material which especially adapts it for the purpose last mentioned is that large numbers of pieces formed from it can be packed together and baked withoutdanger of their becoming fixed together. In this respect and also in its ability to resist heat the material is superior to porcelain, while its insulating qualities are sufiiciently high for ordinary electrical uses.

The material which I have devised consists, mainly, of s 4. with water an l'lirtt'cl. Elltii it: il'uLHL- can th, dc x r the like. The prapo: tions in 'wlizcri l -;.:llly mix the elements mentioned are: one hundred parts soa )stone or talcowd r fifteen parts tragacanth anll lhese elements are first mixed to orm a paste or dough and are then molded or otherwise formed into the desired shapes, after which they are dried, and when the drying process is complmy are either baked separately or packed together and subgected to the baking process. I find that they can safely be packed in this Way and that there is little or no tendency for the pieces becoming attached to each other during the baking.

519a Au maisse. SeriaiNo.7Z6,522. tlivspecimensl/ a c l b .1

'iheinsnlating compound above described is well adapted afterit s final treatment to resist. the etlects of intense heat. The compound exceedingly light in weight and posscsses the advantage due to such lightness.

I may add to the described mixture from two to four parts of ma nesium chlorid or a ma' nesiunr nitrate. mting 5o mater-1a )6 t esxgned for use in places where there is little or no danger of exposure to great heat, I sometimes add to the mixture first described about five to fifteen per cent. of Water-glass. Thisadditionhastheetlfectofmalrmg the compound much harder and mechanically considerably stronger. For many uses the compound containing Watv glass would be preferable to one which acked that element. lhaye given to the compoundm'hether containing the water-glass or not, the name talcite,"' and I desire in the present application to claim this compound as a means of electrical insulation, it being understood that for special purposes I may employ slightlyvarying proportions of the elements named.

I claim as my invention 1. A highly-refractory electrical insulating mat rial, consisting of soapstone or talc-powder and water combined with a binder such 7 o as tragacanth, the soapstone or talc-powder being largely in excess of the other materials.

2. A highly-refractory electrical insulating material, consisting of soapstone or talc-powder, water, a binding material such as tragacanth and admixture of water-glass, the soapstone or talc-powder being largely in excess of the other materials.

. Signed by me at Hanover, Germany, this 14th day of July, 1899.

HENRY NOEL POTTER.

Witnesses:

W. K. ANDERSON, KIRKE LATHROP. 

